Exercise machine



FIG. 1 is a perspective view of an exercise machine.

FIG. 2 is a front view of the exercise machine.

FIG. 3 is a back view of the exercise machine.

FIG. 4 is a left side view of the exercise machine.

FIG. 5 is a right side view of the exercise machine.

FIG. 6 is a top view of the exercise machine; and,

FIG. 7 is a bottom view of the exercise machine.

The broken lines which define the bounds of the claimed design form no part thereof. 

CLAIM The ornamental design for an exercise machine, substantially as shown and described. 